(536f) Lignin Coupled with Catalyst Pyrolysis to Selective Production Chemicals: Influence of Lignin Structure and Properties of Catalyst.

A new method for preparing phenols and aromatic hydrocarbons by in situ catalytic pyrolysis of pretreated lignin was studied. In order to further improve the selectivity of lignin pyrolysis products, due to the poor selectivity of current pyrolysis products, the influence of pyrolysis conditions on the formation of lignin pyrolysis products was investigated through the regulation of lignin structure, pyrolysis temperature and pyrolysis catalyst during pyrolysis. The Py-GC-MS analysis showed that phenol and its homologs accounted for 79.14% of the pyrolysis products of softwood kraft lignin catalyzed by TiO₂, and aromatic hydrocarbons accounted for 73.06% of the pyrolysis products of hydroxypropyl modified lignin catalyzed by HZSM. In addition, the pyrolysis of the lignin dimer model was also carried out to explore the pyrolysis reaction path of the lignin model, and the pyrolysis mechanism of the lignin model under the action of the catalyst was also described. These findings provide a new, green pathway for the production of high purity platform chemicals, which can ultimately facilitate the utilization of lignin through pyrolysis.